제출 #597095

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
597095		Merakulus	A Huge Tower (CEOI10_tower)	C++17	100 / 100	278 ms	8220 KiB

tower

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;

#define ll long long

int mod = 1e9 + 9;

int main(){
    int n = 0;
    int d = 0;
    ll ans = 1;

    cin >> n >> d;

    vector<int> size(n);

    for(int i = 0; i < n; i++){
        cin >> size[i];
    }

    sort(size.begin(), size.end());

    int l = 0;

    for(int i = 0; i < n; i++){
        while(l < i && size[i] - size[l] > d){
            l += 1;
        }

        int iSize = i - l + 1;

        ans *= iSize;

        ans %= mod;
    }

    cout << ans << endl;

    return 0;
}

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